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Licensed Unlicensed Requires Authentication Published by De Gruyter June 22, 2020

Study of Mechanical and Moisture Absorption Behavior of Epoxy/Cloisite-15A Nanocomposites Processed Using Twin Screw Extruder

G. Angadi , H. N. N. Murthy , R. Sridhar , S. Firdosh and T. S. Roopa

Abstract

This paper presents the effect of process parameters of twin screw extruder and addition of Cloisite-15A on mechanical, thermal and moisture barrier properties of epoxy/Cloisite-15A nanocomposites. Four lobed kneading blocks were used the in shearing zone of the extruder, based on their effectiveness in dispersing nanofillers in epoxy. Screw speeds from 100 min−1 to 400 min−1, number of passes up to 15, temperature from 5°C to 80°C and Cloisite-15A contents from 1 wt.% to 2.5 wt.% were considered for designing the L12 Orthogonal Array. Improvements in tensile strength, compression strength, flexural strength, impact strength, hardness and moisture diffusivity in the nanocomposites were 11.89%, 20.06%, 27.73%, 37.26%, 25.48% and 56.22% respectively, when compared to neat epoxy. The improvements were achieved for screw speed of 400 min–1, 5 passes through the extruder, processing temperature of 5°C and 2 wt.% of Cloisite-15A. Dispersion of Cloisite-15A in epoxy was studied by XRD, SEM and TEM. Thermal stability and moisture barrier properties were superior in the nanocomposites.


*Correspondence address, Mail address: H. N. Narasimha Murthy, Department of Mechanical Engineering RV College of Engineering, Bangalore-560059, Karnataka, India, E-mail:

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Received: 2019-08-10
Accepted: 2020-02-06
Published Online: 2020-06-22
Published in Print: 2020-07-03

© 2020, Carl Hanser Verlag, Munich

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